Generally buffer overflow should be stopped by DEP.If you have an alert from an A/V you will need to post more info, as it could be anything from, bad programming of software to malware and anything in between.

What A/V, what specific alert, give details etc, as generally speaking you can not get a specific answer to your question. See the links posted in the other topic.

Also you shouldn't start 2 topics for the same question.I'm betting this one will get locked.--The only thing necessary for the triumph of evil is for good men to do nothing - Edmund Burke